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• ·½·¨Ò»£ºÍ¨¹ý¶ÁÈ¡XMLÎļþ·´ÉäÉú³É¶ÔÏó
• ·½·¨¶þ£ºÍ¨¹ýSpringÌṩµÄutilsÀà»ñÈ¡ApplicationContext¶ÔÏó
• ·½·¨Èý£º¼Ì³Ð×Ô³éÏóÀàApplicationObjectSupport
• ·½·¨ËÄ£º¼Ì³Ð×Ô³éÏóÀàWebApplicationObjectSupport
• ·½·¨Î壺ʵÏÖ½Ó¿ÚApplicationContextAware
• ·½·¨Áù£ºÍ¨¹ýSpringÌṩµÄContextLoader

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·½·¨Ò»£ºÍ¨¹ý¶ÁÈ¡XMLÎļþ·´ÉäÉú³É¶ÔÏó

ApplicationContext ac = new FileSystemXmlApplicationContext("applicationContext.xml");
ac.getBean("userService");//±ÈÈ磺<bean id="userService" class="com.cloud.service.impl.UserServiceImpl"></bean>

˵Ã÷£ºÕâÑùµÄ·½Ê½ÊÊÓÃÓÚ’ñÓÃSpring¿ò¼ÜµÄ¶ÀÁ¢Ó¦ÓóÌÐò£¬ÐëÒª³ÌÐòͨ¹ýÅäÖÃÎļþÊÖ¹¤³õʼ»¯SpringµÄÇé¿ö¡£

·½·¨¶þ£ºÍ¨¹ýSpringÌṩµÄ¹¤¾ßÀà»ñÈ¡ApplicationContext¶ÔÏó

ApplicationContext ac1 = WebApplicationContextUtils.getRequiredWebApplicationContext(ServletContext sc);
ApplicationContext ac2 = WebApplicationContextUtils.getWebApplicationContext(ServletContext sc);
ac1.getBean("beanId");
ac2.getBean("beanId");

˵Ã÷£ºÕâÑùµÄ·½Ê½ÊʺÏÓÚSpring¿ò¼ÜµÄB/Sϵͳ£¬Í¨¹ýServletContext¶ÔÏó»ñÈ¡ApplicationContext¶ÔÏó¡£È»ºóÔÚͨ¹ýËü»ñÈ¡ÐëÒªµÄÀàʵÀý¡£ÉÏÃæÁ½¸ö¹¤¾ß·½Ê½µÄ²î±ðÊÇ£¬Ç°ÕßÔÚ»ñȡʧ°ÜʱÅ׳öÒì³£¡£ºóÕß·µ»Ønull¡£

·½·¨Èý£º¼Ì³Ð×Ô³éÏóÀàApplicationObjectSupport

˵Ã÷£º³éÏóÀàApplicationObjectSupportÌṩgetApplicationContext()·½·¨¡£Äܹ»·½±ãµÄ»ñÈ¡ApplicationContext¡£

Spring³õʼ»¯Ê±¡£»áͨ¹ý¸Ã³éÏóÀàµÄsetApplicationContext(ApplicationContext context)·½·¨½«ApplicationContext ¶ÔÏó×¢Èë¡£

·½·¨ËÄ£º¼Ì³Ð×Ô³éÏóÀàWebApplicationObjectSupport

˵Ã÷£ºÀàËÆÉÏÃæ·½·¨¡£µ÷ÓÃgetWebApplicationContext()»ñÈ¡WebApplicationContext

·½·¨Î壺ʵÏÖ½Ó¿ÚApplicationContextAware

˵Ã÷£ºÊµÏָýӿڵÄsetApplicationContext(ApplicationContext context)·½·¨£¬²¢±£´æApplicationContext ¶ÔÏó¡£Spring³õʼ»¯Ê±£¬»áͨ¹ý¸Ã·½·¨½«ApplicationContext¶ÔÏó×¢Èë¡£

ÏÂÃæÊÇʵÏÖApplicationContextAware½Ó¿Ú·½Ê½µÄ´úÂ룬ǰÃæÁ½ÖÖ·½·¨ÀàËÆ£º

public class SpringContextUtil implements ApplicationContextAware { 
 
  // SpringÓ¦ÓÃÉÏÏÂÎÄ»·¾³ 
  private static ApplicationContext applicationContext; 
 
  /** 
   * ʵÏÖApplicationContextAware½Ó¿ÚµÄ»Øµ÷·½·¨¡£ÉèÖÃÉÏÏÂÎÄ»·¾³ 
   * 
   * @param applicationContext 
   */ 
  public void setApplicationContext(ApplicationContext applicationContext) { 
    SpringContextUtil.applicationContext = applicationContext; 
  } 
 
  /** 
   * @return ApplicationContext 
   */ 
  public static ApplicationContext getApplicationContext() { 
    return applicationContext; 
  }  
  /** 
   * »ñÈ¡¶ÔÏó 
   * 
   * @param name 
   * @return Object
   * @throws BeansException 
   */ 
  public static Object getBean(String name) throws BeansException { 
    return applicationContext.getBean(name); 
  } 
}

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·½·¨Áù£ºÍ¨¹ýSpringÌṩµÄContextLoader

WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();
wac.getBean(beanID);

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JUNIT²âÊÔʱContextLoader.getCurrentWebApplicationContext()=NULL

ÔÚJUNIT²âÊÔ·½·¨ÖмÓÈëÒÔÏ´úÂ룬Õýʽ»·¾³²»ÓÃ

MockServletContext sc = new MockServletContext("");
sc.addInitParameter(ContextLoader.CONFIG_LOCATION_PARAM, "/applicationContext.xml");
ServletContextListener listener = new ContextLoaderListener();
ServletContextEvent event = new ServletContextEvent(sc);
listener.contextInitialized(event);

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